---
title: "Logs in a user to Roblox based on the user's authenticated external provider session"
method: POST
path: "/v1/external/login"
tags: ["Accounts"]
---

# Logs in a user to Roblox based on the user's authenticated external provider session

`POST /v1/external/login`

## Request body

- RobloxAuthenticationApiModelsRequestExternalLoginRequest
  - `identityProvider` 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 999
  - `additionalData` object
  - `authenticationProof` string

## Response `200`

OK

- RobloxAuthenticationApiModelsResponseExternalIdentityGatewayExternalLoginResponse
  - `success` boolean

## Other responses

- `400` — 30: Platform is not supported for SSO login.
- `401` — 31: No linked account found for SSO login.
- `403` — 0: Token Validation Failed
- `500` — 0: An unexpected error occurred.
- `501` — 0: An unexpected error occurred.

## Changes

- **2026-09-03** `d9b4ae8b3380` — 1 info
  - endpoint added

[Change history](https://skmtc.dev/roblox/apis/roblox-api/changes/v1/external/login/post.md)

---

[API](https://skmtc.dev/roblox/apis/roblox-api.md) · [All operations](https://skmtc.dev/roblox/apis/roblox-api/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/roblox/roblox-api/revisions/d9b4ae8b3380/schema)